Air Filter Cleaning – Replacement Guide for 2020 GAS GAS EC300

Shop parts for a 2020 GAS GAS EC300 Dirt Bike.

Keeping your 2020 GAS GAS EC300 running strong starts with a clean air filter. The high-performance 300cc two-stroke engine thrives on clean air and is unforgiving of dust, water, and debris entering the intake—a dirty or damaged filter risks costly repairs. This guide covers cleaning, inspection, and replacement steps tailored to your EC300, plus pro tips for this model's unique features.

Know Your EC300: Model-Specific Notes

  • The 2020 EC300 uses a high-capacity foam air filter designed for rapid removal–installation. Its air box allows tool-free filter access.
  • A sealed air boot is critical—always check for a tight fit when reassembling to avoid dirt bypass.
  • Be especially vigilant during wet or muddy rides. Gas Gas recommends frequent inspections in these conditions to prevent moisture or silt reaching the engine and power valve.

When to Service Your Air Filter

  • After every dusty, muddy, or wet ride
  • At least every 10 hours of normal use, or as part of your regular maintenance routine
  • If you notice power loss, increased smoke, or unusual engine noise

Tools & Supplies

  • Nitrile gloves
  • Plastic bin for cleaning
  • Air filter cleaner or mild degreaser (non-petroleum)
  • Air filter oil (foam filter specific)
  • Spare filters for quick swaps
  • Clean rags

How to Clean Your 2020 GAS GAS EC300 Air Filter

  1. Remove the seat:
    Pull the quick-release or unscrew the seat bolt, then lift off the seat to access the air box.
  2. Remove the air filter:
    Unclip and carefully pull out the air filter. Double-check for debris falling into the air boot–use a clean rag to plug the intake during cleaning.
  3. Inspect for damage:
    Check for tears, deteriorated foam, or broken seams. Replace if damaged.
  4. Pre-clean:
    Tap or gently squeeze out excess dirt (never twist foam).
  5. Wash the filter:
    Completely saturate in cleaning solution and work out all dirt. Rinse in clean water until all soap is flushed away. Allow to air dry completely–never use compressed air or heat.
  6. Apply filter oil:
    Saturate the foam with filter oil and massage it in for full coverage. Avoid excess oil that could drip into the intake.
  7. Reinstall filter:
    Remove the air box rag, check for debris. Align and seat the air filter securely, confirm a dust-proof seal.
  8. Reinstall seat:
    Secure the seat and confirm everything is properly latched.

Signs You Should Replace the Air Filter

  • Foam has tears, holes, or thin spots
  • Seams are separating
  • Dirt cannot be fully washed out
  • Filter has lost its original shape or elasticity

Extra Tips for the EC300

  • Keep a spare, pre-oiled filter for quick swaps at the track or trail head.
  • Periodically inspect the air box gasket–replace if worn to preserve filtration efficiency.
  • After rides in heavy silt or water crossings, inspect and clean the filter immediately.
  • Careful installation is essential. Always check the filter is properly seated against the air boot to avoid unfiltered air leaks.

Regular air filter maintenance on the 2020 GAS GAS EC300 guards performance and protects your engine—don't overlook this simple but vital routine.

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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.